Alloy



Patented Nov. 24, 1925.

UNITED STATES CHARLES ALEXANDER FONTANE, or PAmsrRANoE, .a'bsrenoa T EMILE GONTI, or

ALFORTVILLE, FRANCE.

' 1,563,079 PATENT. OFFICE.

ALLOY.

No Drawing.

To all whom it may concern:

Be it known that I, CHARLES ALEXANDRE FON'JANE, a citizen of the French Republic,

13 to autogenous soldering and also to temper-' 'ing so as to preserve its resisting qualities.

., The composition of the improved alloy is as follows: 9596% aluminium, 43% copper, 0.80.2 manganese, 0.2-0.8 silver, the

-23 manufacture of the alloy without the use of any -flux is eflected in the following manner v The aluminium is placed in a plumbago crucible. When it commences to become L 2 pasty, the firing must not be too energetic so that burning may be avoided. At this time the copper is added which copper could be slightly heated previously so as not to lower the temperature of the bath. The mixture is suitably stirred with a plumbago rod to ensure thorough mixing, then the silver is added.

These operations are performed without unduly raising the temperature.

first trans'lorn'ied into cupro-manganese in the proportions of to 32%. This cupro manganese is fused separately in a plumbago crucible whilst avoiding oxidation. When the product begins to precipitate and falls to the bottom of. the crucible in' lumps, it is run into the bath. It is then agitated so that the alloy thus constituted may be well fused and perfectly homogeneous. When it has been determined with certainty that the product thus obtained is not burnt and that it is perfectly satisfactory, it-is run' into ingot moulds to form plates. \Vhen'it is to be run into sand or into shell the temperature may be slightly lowered according to the thickness. In View of the fact that the shrinkage is about the same asthat of aluminium it is necessary to provide considerable running space to supply the mould during cooling.

a; For the last operation the manganese is.

Application filed February 2, 1924. Serial No. b90302.

The properties of the new alloy are the following It can be rolled very satisfactorily and. in all thicknesses.

Tension tests carried out in the laboratories of the Arts et Metiers with a thickresults Resistance. Breaking strain 48 to 50 kg. per square millimeter.

Limit of elasticity 32 to 35 kg. per square millimeter. I

Elongation 8.9 to 10.9%.

Density 2.78 to 2.9. i

In regard to breaking, according to tests carried out in the laboratories of the Arts et Metiers upon a boltv with six faces,

ness of 15/10 mm. have given the following 110 mm. long and 18 mm. in diameter screw.

threaded with a 2.0mm. thread for a length of 40 mm. and provided with a'hexagonal nut, the pull between the head of the bolt andthe hexagonal nut showed the breaking strain was 7 kg, the density being 2.814. This alloy. is very malleable, is bent very easily, is adapted to be embossed and retains the exact shape when stamped. It is unaffected by air and inoxidizable. It resists powerfully nitric and sulphuric acids as Well as organic acids, but caustic alkalis and drochloric acid attack it strongly. It is more inalterable in air than all metals, ex

cept platinum. It is very expansible, nearlyv twice as much so as steeland' a little more so that silver. Its powers of resistance mentioned above which are considerable are not obtained with heat treatment, but are the natural properties of the alloy due to its composition. "Its great malleability and small density place this new productin' the minium, 4 to 3% copper, 0.8 to 0.2% manga- I nese, 0.2 to 0.8% silver.

In testimony whereof, I have signed my name to this specification at Paris, France,

this 21st day of January, 1924:.

IFONTANE, crimes ALEXANDRE. 

